Freshwater ciliates as ecophysiological model organisms – lessons
... of asexual reproduction is, however, different between daphnids and planktonic ciliates. In the latter, cell division results in two new daughter cells, thus doubling the population number. In the former, the clutch size, i. e. the number of eggs in the brood chamber of the female Daphnia, may vary ...
... of asexual reproduction is, however, different between daphnids and planktonic ciliates. In the latter, cell division results in two new daughter cells, thus doubling the population number. In the former, the clutch size, i. e. the number of eggs in the brood chamber of the female Daphnia, may vary ...
special feature - Department of Ecology and Evolutionary Biology
... and nutrient flow in ecosystems have emerged (e.g., Ostrom et al. 1997). One such linkage has been identified using the framework of ecological stoichiometry, the study of the relative balance of nutrients and energy in organisms from different trophic levels (Elser et al. 1996, 2000; Sterner and El ...
... and nutrient flow in ecosystems have emerged (e.g., Ostrom et al. 1997). One such linkage has been identified using the framework of ecological stoichiometry, the study of the relative balance of nutrients and energy in organisms from different trophic levels (Elser et al. 1996, 2000; Sterner and El ...
Teaching Guide - BioMEDIA Associates
... Regulation and Behavior Behavior is one kind of response an organism can make to an internal or environmental stimulus. A behavioral response requires coordination and communication at many levels, including cells, organ systems, and whole organisms. Behavioral response is a set of actions determine ...
... Regulation and Behavior Behavior is one kind of response an organism can make to an internal or environmental stimulus. A behavioral response requires coordination and communication at many levels, including cells, organ systems, and whole organisms. Behavioral response is a set of actions determine ...
Marco-Mendez, C., L. M. Ferrero-Vicente, P. Prado, K. L. Heck, J
... experiments was carried out: 1) Cymodocea nodosa epiphytized (CE) vs. P. oceanica epiphytized (PE); 2) C. nodosa non-epiphytized (CNE) vs. P. oceanica non-epiphytized (PNE); 3) C. nodosa epiphytized (CE) vs. C. nodosa non-epiphytized (CNE); and 4) P. oceanica epiphytized (PE) vs. P. oceanica non-epi ...
... experiments was carried out: 1) Cymodocea nodosa epiphytized (CE) vs. P. oceanica epiphytized (PE); 2) C. nodosa non-epiphytized (CNE) vs. P. oceanica non-epiphytized (PNE); 3) C. nodosa epiphytized (CE) vs. C. nodosa non-epiphytized (CNE); and 4) P. oceanica epiphytized (PE) vs. P. oceanica non-epi ...
The role of multiple pheromones in food recruitment by ants
... sources. Such communication is especially beneficial when food sources are ephemeral or hard to find (Sherman and Visscher, 2002; Dornhaus, 2002), or when they are too large to be exploited by a single individual (Detrain and Deneubourg, 2002). Recruitment towards food sources also provides a specie ...
... sources. Such communication is especially beneficial when food sources are ephemeral or hard to find (Sherman and Visscher, 2002; Dornhaus, 2002), or when they are too large to be exploited by a single individual (Detrain and Deneubourg, 2002). Recruitment towards food sources also provides a specie ...
Effects of interactions between the green and brown food webs on
... decomposers; 2) generalist consumers feed on prey from both food webs; and 3) the spatial connections between the two food webs through mobile generalist consumers at the top and through nutrient and detritus fluxes at the bottom of the food webs. The first model couples the green and brown food web ...
... decomposers; 2) generalist consumers feed on prey from both food webs; and 3) the spatial connections between the two food webs through mobile generalist consumers at the top and through nutrient and detritus fluxes at the bottom of the food webs. The first model couples the green and brown food web ...
pdf
... or reduced larval quality and metamorphic/postmetamorphic success. Low fecundities of clams in GSB relative to other mid-Atlantic south shore estuaries were documented by the HCRI in 2001. • Predation. Analysis of long-term predator surveys showed that the decline in hard clam abundance could not b ...
... or reduced larval quality and metamorphic/postmetamorphic success. Low fecundities of clams in GSB relative to other mid-Atlantic south shore estuaries were documented by the HCRI in 2001. • Predation. Analysis of long-term predator surveys showed that the decline in hard clam abundance could not b ...
in Ecos with links
... on the environment from an increasingly consumerist society, divorced from where their food comes from, yet seeking succour from experiencing nature and getting rewards from leisure. While there are various takes on rewilding (some based on single issue proposals), the range of public benefits can b ...
... on the environment from an increasingly consumerist society, divorced from where their food comes from, yet seeking succour from experiencing nature and getting rewards from leisure. While there are various takes on rewilding (some based on single issue proposals), the range of public benefits can b ...
In search of operational trophospecies in a tropical aquatic ,food web
... trophic activity, then we need to explore alternative ways in which these two aspects interact. One can Original trophicentities imagine casesin which the composition of an animal's The ideal trophic data would be resolved to the biolog- diet might influencethe composition of its set of predaical sp ...
... trophic activity, then we need to explore alternative ways in which these two aspects interact. One can Original trophicentities imagine casesin which the composition of an animal's The ideal trophic data would be resolved to the biolog- diet might influencethe composition of its set of predaical sp ...
Do small mammals prey upon an invasive ectoparasite of cervids?
... we explored whether the deer ked has small mammalian predators that could potentially affect the population of deer ked in the northern Boreal region. To date, there is only one study on avian predation on the deer ked (Kaunisto et al. 2012), even though predation was proposed as a possible regulati ...
... we explored whether the deer ked has small mammalian predators that could potentially affect the population of deer ked in the northern Boreal region. To date, there is only one study on avian predation on the deer ked (Kaunisto et al. 2012), even though predation was proposed as a possible regulati ...
The behavioural trade-off of Margaritifera margaritifera with regard to
... chemoreceptors among various sense organs and is able to gather information from i.e. kairomones to make an adaptive response to changes in its environment (Wilson et al., 2012). The few kairomone samples that have been partly characterized show that they consist of proteins and large non-peptides ( ...
... chemoreceptors among various sense organs and is able to gather information from i.e. kairomones to make an adaptive response to changes in its environment (Wilson et al., 2012). The few kairomone samples that have been partly characterized show that they consist of proteins and large non-peptides ( ...
13.1 Ecologists Study Relationships
... through the food web, and returns to the atmosphere. – Carbon is emitted by the burning of fossil fuels. – Some carbon is stored for long periods of time in areas called carbon sinks. carbon dioxide in air combustion ...
... through the food web, and returns to the atmosphere. – Carbon is emitted by the burning of fossil fuels. – Some carbon is stored for long periods of time in areas called carbon sinks. carbon dioxide in air combustion ...
How top consumers structure food webs with multiple pathways of
... In the context of food webs ontogeny splits a population node into at least two stagespecific nodes (juveniles and adults), which are linked through maturation and reproduction. These stage-specific nodes may differ in their feeding links to both potential prey and potential predators. In spite of i ...
... In the context of food webs ontogeny splits a population node into at least two stagespecific nodes (juveniles and adults), which are linked through maturation and reproduction. These stage-specific nodes may differ in their feeding links to both potential prey and potential predators. In spite of i ...
A brown-world cascade in the dung decomposer food web of an
... trullifolia, and Thalictrum alpinum, are sometimes also abundant in the meadow. Total vegetation cover in midsummer is .80%, and average maximum plant height is ;30 cm. The growing season usually covers about three months from early June to late August or early September, depending on annual climate ...
... trullifolia, and Thalictrum alpinum, are sometimes also abundant in the meadow. Total vegetation cover in midsummer is .80%, and average maximum plant height is ;30 cm. The growing season usually covers about three months from early June to late August or early September, depending on annual climate ...
University of Groningen Ecology of Estuarine Macrobenthos
... production and returns nutrients to the deeper water layers. It may take years before these nutrients can be utilized by photoautotrophs again. In estuarine systems, however, pelagic-benthic links are not only quantitatively more important, but also qualitatively different, since the benthos can be ...
... production and returns nutrients to the deeper water layers. It may take years before these nutrients can be utilized by photoautotrophs again. In estuarine systems, however, pelagic-benthic links are not only quantitatively more important, but also qualitatively different, since the benthos can be ...
Do delayed effects of overgrazing explain population cycles in voles?
... et al. 1983, Seldal et al. 1994). Furthermore, Freeland (1974) and Plesner Jensen and Doncaster (1999) have suggested that increased amounts of plants with higher concentration of toxins are inevitably ingested at high population densities of rodents because of a concurrent decrease in the preferre ...
... et al. 1983, Seldal et al. 1994). Furthermore, Freeland (1974) and Plesner Jensen and Doncaster (1999) have suggested that increased amounts of plants with higher concentration of toxins are inevitably ingested at high population densities of rodents because of a concurrent decrease in the preferre ...
Estimating larval fish ingestion rates: can laboratory derived values
... In developing this data set w e used only microzooplankton abundance estimates derived in studies that employed mesh sizes < 200 pm. This was done because early stage larvae generally consume prey smaller than this size (Theilacker & Dorsey 1980, Frank 1988). In some studies zooplankton samples were ...
... In developing this data set w e used only microzooplankton abundance estimates derived in studies that employed mesh sizes < 200 pm. This was done because early stage larvae generally consume prey smaller than this size (Theilacker & Dorsey 1980, Frank 1988). In some studies zooplankton samples were ...
SCHULZE, PETER C., HORACIO E. ZAGARESE, AND CRAIG E
... Lampert and Muck concluded that the threshold food concentration for maintenance of body mass by adults is around 50 pg C liter - l for both species, which is within the range of ultraoligotrophic conditions (Wetzel 1975). Lampert and Muck noted that, by focusing on adults, they were unable to deter ...
... Lampert and Muck concluded that the threshold food concentration for maintenance of body mass by adults is around 50 pg C liter - l for both species, which is within the range of ultraoligotrophic conditions (Wetzel 1975). Lampert and Muck noted that, by focusing on adults, they were unable to deter ...
terrestrial food webs All wet or dried up? Real differences between
... boundaries. However, large differences in emphasis persist among ecologists working in different environments. For instance, evidence for the role of bottom-up factors (abiotic resources like nutrients, energy and water) in controlling terrestrial primary productivity is unequivocal, while that for ...
... boundaries. However, large differences in emphasis persist among ecologists working in different environments. For instance, evidence for the role of bottom-up factors (abiotic resources like nutrients, energy and water) in controlling terrestrial primary productivity is unequivocal, while that for ...
Effects of taxonomic and trophic aggregation on food web properties
... resolution after individual webs were aggregated to approximately one-half their original size. Two of the eight properties, the fraction of basal species and SC (the product of species richness S and web connectance C, see below), showed large systematic departures from initial conditions following ...
... resolution after individual webs were aggregated to approximately one-half their original size. Two of the eight properties, the fraction of basal species and SC (the product of species richness S and web connectance C, see below), showed large systematic departures from initial conditions following ...
Fractal Hypothesis of the Pelagic Microbial Ecosystem—Can Simple
... thus subject to intensive research, and many questions related to regulating processes and impacts of environmental change remain open. Perhaps an even more fundamental biological question regards the enormous biodiversity that is generated and maintained in the pelagic microbial community. Sequenci ...
... thus subject to intensive research, and many questions related to regulating processes and impacts of environmental change remain open. Perhaps an even more fundamental biological question regards the enormous biodiversity that is generated and maintained in the pelagic microbial community. Sequenci ...
Stable isotope analyses of benthic organisms in Lake Baikal
... Haines & Montague, 1979; Rau, 1980, 1981). For example, δ 13 C enrichment of less than 1‰ was reported for whole animal bodies (DeNiro & Epstein, 1978; McConnaughey & McRoy, 1979; Rau et al., 1983). In fact, since the δ 13 C value of organisms is close to that of the food bases in their food chain, ...
... Haines & Montague, 1979; Rau, 1980, 1981). For example, δ 13 C enrichment of less than 1‰ was reported for whole animal bodies (DeNiro & Epstein, 1978; McConnaughey & McRoy, 1979; Rau et al., 1983). In fact, since the δ 13 C value of organisms is close to that of the food bases in their food chain, ...
MANN, K. H. Production and use of detritus in various freshwater
... loop” and its utilization in higher trophic levels is a.n urgent topic for further study. ...
... loop” and its utilization in higher trophic levels is a.n urgent topic for further study. ...
Local food
Local food or the local food movement is a movement which aims to connect food producers and food consumers in the same geographic region; in order to develop more self-reliant and resilient food networks, improve local economies, or for health, environmental, community, or social impact in a particular place. The term has also been extended to include not only geographic location of supplier and consumer but can also be ""defined in terms of social and supply chain characteristics."" For example, local food initiatives often promote sustainable and organic farming practices, although these are not explicitly related to the geographic proximity of the producer and consumer.Local food represents an alternative to the global food model, a model which often sees food travelling long distances before it reaches the consumer. A local food network involves relationships between food producers, distributors, retailers, and consumers in a particular place where they work together to increase food security and ensure economic, ecological and social sustainability of a community